Saving files that are mounted into a container works in more cases

Claude Code usually saves a file safely by writing a new copy and then swapping it in for the old one. That swap can fail with a "busy" error when the file is bind-mounted, meaning it is a file from another location, such as your computer, mapped into a container. Claude Code now checks the system's list of mounts in /proc/self/mounts when this happens. For one particular filesystem type, it then writes straight into the existing file instead.